Desktop Board Features
13
Input/Output (I/O) Controller
The SMSC LPC47M102 ultra I/O controller features the following:
• Low pin count (LPC) interface
• 3.3 V operation
• One serial port
• One parallel port with Extended Capabilities Port (ECP) and Enhanced Parallel Port
(EPP) support
• Serial IRQ interface compatible with serialized IRQ support for PCI systems
• PS/2-style mouse and keyboard interfaces
• Interface for one 1.2 MB, 1.44 MB, or 2.88 MB diskette drive
• Intelligent power management, including a programmable wake up event interface
• PCI power management support
• IrDA
†
1.0 compliant
• Fan control:
Two fan control outputs
Two fan tachometer inputs
Real-Time Clock
The Real-Time Clock (RTC) is integrated into the chipset. The RTC provides battery backed-up
date and time keeping device with two banks of static RAM with 128 bytes each. A battery on the
board keeps the clock current when the computer is turned off.
✏
NOTE
The recommended method of accessing the date in systems with Intel desktop boards is indirectly
from the Real-Time Clock (RTC) via the BIOS. The BIOS on Intel desktop boards contains a
century checking and maintenance feature that checks the least two significant digits of the year
stored in the RTC during each BIOS request (INT 1Ah) to read the date and, if less than 80 (i.e.,
1980 is the first year supported by the PC), updates the century byte to 20. This feature enables
operating systems and applications using the BIOS date/time services to reliably manipulate the
year as a four-digit value.
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